/********************************************************/
/*  Xpress-BCL C# Example Problems                      */
/*  ==============================                      */
/*                                                      */
/*  file xbworks.cs                                     */
/*  ```````````````                                     */
/*  Example for the use of Xpress-BCL                   */
/*  (Workshop planning example from XPRESS-MP tutorial) */
/*                                                      */
/*  (c) 2008-2024 Fair Isaac Corporation                */
/*      authors: S.Heipcke, D.Brett.                    */
/********************************************************/

using System;
using System.Text;
using System.IO;
using BCL;


namespace Examples
{
    public class TestWorkshop
    {
        const int NProd = 2;                  /* Number of products */
        const int NShop = 3;                  /* Number of workshops */
        const int WMAX = 40;                  /* Maximum weekly working time */

        /****DATA****/
        int[,] DUR =  {{5, 9, 7},  /* Duration of product p on shop s */
        {10, 2, 5}};
        int[] RES = {10, 8};           /* Man hours per unit */
        int[] PRICE = {108, 84};         /* Selling price per unit */

        /***********************************************************************/

        public static void Main()
        {
            XPRB.init();
            int p,s;
            XPRBexpr l = new XPRBexpr();
            XPRBvar[] x = new XPRBvar[NProd];               /* Amount of product p */
            XPRBprob pb = new XPRBprob("Workshop");        /* Initialize a new problem in BCL */

            TestWorkshop TestInstance = new TestWorkshop();

            /****VARIABLES****/
            for(p=0;p<NProd;p++)  x[p] = pb.newVar("x");

            /****OBJECTIVE****/
            for(p=0;p<NProd;p++)
                l += (TestInstance.PRICE[p] - 5 * TestInstance.RES[p]) * x[p];
            pb.setObj(pb.newCtr("OBJ",l));  /* Set obj. function: maximize benefit */

            /****CONSTRAINTS****/
            for(s=0;s<NShop;s++)            /* Limit on weekly working hours */
            {
                l = new XPRBexpr();
                for (p = 0; p < NProd; p++) l += TestInstance.DUR[p,s] * x[p];
                pb.newCtr("ResMax",l <= WMAX);
            }

            /****SOLVING + OUTPUT****/
            pb.setSense(BCLconstant.XPRB_MAXIM);
            pb.lpOptimize();
            System.Console.WriteLine("Objective: " + pb.getObjVal());  /* Get objective value */
            for(p=0;p<NProd;p++)            /* Print the solution values */
            System.Console.Write(x[p].getName() + ":" + x[p].getSol() + " ");
            System.Console.WriteLine();

            return;
        }
    }
}